Electromechanical behaviors of soft and hard PZTs under different compressive stress pulses

Abstract

In the present study, soft and hard PZTs discharge experiments under extrusion/impact were carried out to analyze the electromechanical behaviors under open and short circuit conditions. The results show that when subjected to extrusion, the soft PZT is more sensitive to stress, the hard PZT has higher discharge capacity under high-impedance (regard as open-circuit) condition, and the force-electric relationship of the two PZTs satisfy the traditional piezoelectric equation. Under impact, the open-circuit elastic compliance coefficient of two PZTs increases with the increase of stress, the maximum value is about 50 times of the quasi-static value, and the piezoelectric voltage coefficient is about 20% of the quasi-static value. The short-circuit elastic compliance coefficient of soft PZT is 10 times of the quasi-static coefficient, and the dynamic piezoelectric strain coefficient is 250% of the quasi-static coefficient. However, the dynamic stress-strain of hard PZT is nonlinear and the dynamic piezoelectric strain coefficient is 500 × 10−12 m/V, which is about double of the quasi-static constant.